Modification of a standard cobalt-60 unit for total body irradiation at 150 cm SSD
A cobalt-60 teletherapy unit has been modified to permit total body irradiation (TBI) with a vertical beam in a conventional treatment room. This technique has been implemented at low cost using a few easily made accessories. Removal of the adjustable collimator assembly provides a field 2.3 meters in diameter at 150 cm SSD. A copper flattening filter has been constructed to improve beam uniformity and remove electron contamination. Machine set up time for TBI requires less than 15 minutes and does not affect the routine clinical use of the unit. A dose rate of 32 cGy per minute (midplane) is attainable in a 20 cm thick patient. The dosimetry and technical aspects are presented in this paper.
- Research Organization:
- Ontario Cancer Treatment and Research Foundation, Hamilton
- OSTI ID:
- 6865393
- Journal Information:
- Int. J. Radiat. Oncol., Biol. Phys.; (United States), Journal Name: Int. J. Radiat. Oncol., Biol. Phys.; (United States) Vol. 10:6; ISSN IOBPD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
61 RADIATION PROTECTION AND DOSIMETRY
62 RADIOLOGY AND NUCLEAR MEDICINE
655003 -- Medical Physics-- Dosimetry
ALKALI METAL COMPOUNDS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BUILDUP
CALCULATION METHODS
CALIBRATION
COBALT 60
COBALT ISOTOPES
DOSIMETRY
ELECTROMAGNETIC RADIATION
EXTERNAL IRRADIATION
FLUORIDES
FLUORINE COMPOUNDS
GAMMA DOSIMETRY
GAMMA RADIATION
HALIDES
HALOGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
IRRADIATION
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LITHIUM COMPOUNDS
LITHIUM FLUORIDES
LITHIUM HALIDES
MINUTES LIVING RADIOISOTOPES
MOCKUP
NUCLEI
ODD-ODD NUCLEI
PHANTOMS
RADIATION DOSE DISTRIBUTIONS
RADIATIONS
RADIOISOTOPES
STRUCTURAL MODELS
WHOLE-BODY IRRADIATION
YEARS LIVING RADIOISOTOPES